The VC1 decoder was missing lots of important fast paths for Arm, especially for 64-bit Arm. This submission fills in implementations for all functions where a fast path already existed and the fallback C implementation was taking 1% or more of the runtime, and adds a new fast path to permit vc1_unescape_buffer() to be overridden.
I've measured the playback speed on a 1.5 GHz Cortex-A72 (Raspberry Pi 4) using `ffmpeg -i <bitstream> -f null -` for a couple of example streams: Architecture: AArch32 AArch32 AArch64 AArch64 Stream: 1 2 1 2 Before speed: 1.22x 0.82x 1.00x 0.67x After speed: 1.31x 0.98x 1.39x 1.06x Improvement: 7.4% 20% 39% 58% `make fate` passes on both AArch32 and AArch64. Ben Avison (6): avcodec/vc1: Arm 64-bit NEON deblocking filter fast paths avcodec/vc1: Arm 32-bit NEON deblocking filter fast paths avcodec/vc1: Arm 64-bit NEON inverse transform fast paths avcodec/idctdsp: Arm 64-bit NEON block add and clamp fast paths avcodec/blockdsp: Arm 64-bit NEON block clear fast paths avcodec/vc1: Introduce fast path for unescaping bitstream buffer libavcodec/aarch64/Makefile | 6 +- libavcodec/aarch64/blockdsp_init_aarch64.c | 42 + libavcodec/aarch64/blockdsp_neon.S | 43 + libavcodec/aarch64/idctdsp_init_aarch64.c | 26 +- libavcodec/aarch64/idctdsp_neon.S | 130 ++ libavcodec/aarch64/vc1dsp_init_aarch64.c | 93 ++ libavcodec/aarch64/vc1dsp_neon.S | 1552 ++++++++++++++++++++ libavcodec/arm/vc1dsp_init_neon.c | 74 + libavcodec/arm/vc1dsp_neon.S | 761 ++++++++++ libavcodec/blockdsp.c | 2 + libavcodec/blockdsp.h | 1 + libavcodec/vc1dec.c | 20 +- libavcodec/vc1dsp.c | 2 + libavcodec/vc1dsp.h | 3 + 14 files changed, 2736 insertions(+), 19 deletions(-) create mode 100644 libavcodec/aarch64/blockdsp_init_aarch64.c create mode 100644 libavcodec/aarch64/blockdsp_neon.S create mode 100644 libavcodec/aarch64/idctdsp_neon.S create mode 100644 libavcodec/aarch64/vc1dsp_neon.S -- 2.25.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
